Versatility of Bis(2‐pyridyl)ditellane

Abstract

The different nature of the Te and N binding sites of bis(2pyridyl)ditellane -o Py 2 Te 2 -(1) in reactions with halogen, hydrohalic acids and a metal salt were explored in this work in order to obtain seven compounds: H o PyTeCl 2 (2), H o PyTeBr 2 (3), o PyTeI (4), H o PyTeI 2 (5), H o PyTeI 4 (6), Me o PyTeI 2 (7), and [ o PyTeCuCl] 2 (8). The compounds were structurally characterized by X-ray diffraction, which revealed, in almost all of the compounds, the presence of hypervalent chalcogen adducts containing a formal negative charge located on the Te II or Te IV atom stabilized by the protonated (2, 3, and 5) and methylated (7) pyridyl group. Compound 4 has a dimeric structure built up by association of highly unstable monomeric ArTeX units (X = Cl, Br, I) through Te-N interactions while compound 8 is a binuclear coordination complex, in which 1 behaves as a tridentate ligand, with k 2 N 2 , Te 8 coordination for one Cu I ion and kN 10 coordination for the other Cu I ion.

2-Pyridylselenenyl versus 2-Pyridyltellurenyl Halides: Symmetrical Chalcogen Bonding in the Solid State and Reactivity towards Nitriles

“…Single crystals of 16 were grown from CH2Cl2 solution, and X-ray analysi demonstrated the formation of 2-pyridyltellurenyl bromide (Figure 2). Overall, metrica parameters for 16 are similar to those of earlier reported 2-pyridyltellurenyl halide [44,45]. In contrast, the Se analog 1, which we described earlier, does not exhibit Se⋯Se interactions in the crystal but features analogous Se⋯N ChB and terminal Se⋯Cl ChB forming supramolecular dimers (Figure 3) [46].…”

“…Single crystals of 16 were grown from CH 2 Cl 2 solution, and X-ray analysis demonstrated the formation of 2-pyridyltellurenyl bromide (Figure2). Overall, metrical parameters for 16 are similar to those of earlier reported 2-pyridyltellurenyl halides[44,45].Interestingly, in the crystal packing of 16 each Te atom is involved in four different noncovalent contacts: Te• • • Te interactions, two Te• • • Br ChB and one Te• • • N ChB contacts forming 3D supramolecular symmetrical framework. In contrast, the Se analog 1, which we described earlier, does not exhibit Se• • • Se interactions in the crystal but features analogous Se• • • N ChB and terminal Se• • • Cl ChB forming supramolecular dimers (Figure 3) [46].…”

Bis(2-pyridyl)ditellane as a precursor to CoII, CuI and CuII complex formation: structural characterization and photocatalytic studies

“…Although the redox mechanism is not clear yet, we strongly believe that it involves the formation of a 2-pyridyltellurium bromide species resulting in the reduction of the metallic center. 17 A similar structure was published by our group, under the same reaction conditions, having a chloride ligand instead of bromide. 17 In Table 2 selected bond lengths and angles are presented for 3 .…”

“…17 A similar structure was published by our group, under the same reaction conditions, having a chloride ligand instead of bromide. 17 In Table 2 selected bond lengths and angles are presented for 3 .…”

“…This compound was synthetized according to the procedure described in the literature. 17 A solution of bis(2-pyridyl)ditellane (0.243 mmol; 0.100 g) in THF (6 mL) was layered in a solution of copper( ii ) bromide (0.243 mmol; 0.054 g) in methanol (4 mL). After two days, crystalline orange solid of 3 was obtained from the mixture and collected by filtration.…”